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Gabbro is a dark-colored coarse-grained intrusive igneous rock. The specimen shown above is about two inches (five centimeters) across. Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry.
Examples of intrusive rocks are granite and gabbro. Granite is made up of three common minerals - quartz, mica and feldspar - and when viewed from a distance appear tan, pinkish or gray, depending on the concentrations and grain sizes of the three minerals. This rock is very widely used as a building material, due to its abundance and strength. Gabbro has a lower quartz content than granite, and is therefore much darker. Liquid rock that reaches the surface cools very quickly. As a result of this immediate cooling, the crystals produced are extremely small.